(18) باب الإِثْمِدِ وَالْكُحْلِ مِنَ الرَّمَدِ
Narrated Um Salama:
The husband of a lady died and her eyes became sore and the people mentioned her story to the Prophet They asked him whether it was permissible for her to use kohl as her eyes were exposed to danger. He said, "Previously, when one of you was bereaved by a husband she would stay in her dirty clothes in a bad unhealthy house (for one year), and when a dog passed by, she would throw a globe of dung. No, (she should observe the prescribed period Idda) for four months and ten days.'
Reference: Sahih al-Bukhari 5706
In-book reference: Book 76, Hadith 26
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 7, Book 71, Hadith 607